Handle deferred access as pre-step in SemanticSendVisitor.

tests/compiler/dart2js/semantic_visitor_test_send_visitor.dart

Index: tests/compiler/dart2js/semantic_visitor_test_send_visitor.dart
diff --git a/tests/compiler/dart2js/semantic_visitor_test_send_visitor.dart b/tests/compiler/dart2js/semantic_visitor_test_send_visitor.dart
index a602e2e7955e155a0055c0afc5a624e550715584..713a8c3f4e68866d5ed17a1f41eb482b6683c918 100644
--- a/tests/compiler/dart2js/semantic_visitor_test_send_visitor.dart
+++ b/tests/compiler/dart2js/semantic_visitor_test_send_visitor.dart
@@ -2940,4 +2940,12 @@ class SemanticSendTestVisitor extends SemanticTestVisitor {
         constant: constant.getText()));
     super.visitConstantInvoke(node, constant, arguments, callStructure, arg);
   }
+
+  @override
+  previsitDeferredAccess(
+      Send node,
+      PrefixElement prefix,
+      arg) {
+    visits.add(new Visit(VisitKind.PREVISIT_DEFERRED_ACCESS, element: prefix));
+  }
 }